To conserve energy, estate developers are encouraged to build houses that can retain heat in winter.

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问题 To conserve energy, estate developers are encouraged to build houses that can retain heat in winter.

选项 A、attain
B、keep
C、release
D、generate

答案B

解析 retain的意思是“保留,留下,保持”,与keep意思相近。attain“实现,得到”:release“释放,排放,发行,解脱”;generate“产生,引发”。故选B。
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